【Fits For】:Differential & 13T Main Gear Upgrades Part for 1/10 Granite 3S BLX Senton 3S BLX Big rock 3S BLX. 【High quality material】: Differential Made of high-quality steel material, Hard anodic oxidation and anti-rust treatment on gear surface, long service life for these gears. 【More Durable】:The upgrades part is durable enough,improves the overall performance of the rc car.Specially designed strengthening cut-outs for increased crash resistance. 【Easy to Install】:great for replace the old or broken part.Increase overall performance and durability of your RC car. 【Long-lasting Performance】: The rc car upgrades parts highly increase the strength and precision.